1 #ifndef __LINUX_MEMORY_HOTPLUG_H
2 #define __LINUX_MEMORY_HOTPLUG_H
4 #include <linux/mmzone.h>
5 #include <linux/spinlock.h>
6 #include <linux/notifier.h>
16 #ifdef CONFIG_MEMORY_HOTPLUG
19 * Types for free bootmem stored in page->lru.next. These have to be in
20 * some random range in unsigned long space for debugging purposes.
23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
24 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
30 /* Types for control the zone type of onlined and offlined memory */
39 * pgdat resizing functions
42 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
44 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
47 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
49 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
52 void pgdat_resize_init(struct pglist_data
*pgdat
)
54 spin_lock_init(&pgdat
->node_size_lock
);
57 * Zone resizing functions
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
63 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
65 return read_seqbegin(&zone
->span_seqlock
);
67 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
69 return read_seqretry(&zone
->span_seqlock
, iv
);
71 static inline void zone_span_writelock(struct zone
*zone
)
73 write_seqlock(&zone
->span_seqlock
);
75 static inline void zone_span_writeunlock(struct zone
*zone
)
77 write_sequnlock(&zone
->span_seqlock
);
79 static inline void zone_seqlock_init(struct zone
*zone
)
81 seqlock_init(&zone
->span_seqlock
);
83 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
84 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
85 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
86 /* VM interface that may be used by firmware interface */
87 extern int online_pages(unsigned long, unsigned long, int);
88 extern int test_pages_in_a_zone(unsigned long start_pfn
, unsigned long end_pfn
,
89 unsigned long *valid_start
, unsigned long *valid_end
);
90 extern void __offline_isolated_pages(unsigned long, unsigned long);
92 typedef void (*online_page_callback_t
)(struct page
*page
);
94 extern int set_online_page_callback(online_page_callback_t callback
);
95 extern int restore_online_page_callback(online_page_callback_t callback
);
97 extern void __online_page_set_limits(struct page
*page
);
98 extern void __online_page_increment_counters(struct page
*page
);
99 extern void __online_page_free(struct page
*page
);
101 extern int try_online_node(int nid
);
103 extern bool memhp_auto_online
;
105 #ifdef CONFIG_MEMORY_HOTREMOVE
106 extern bool is_pageblock_removable_nolock(struct page
*page
);
107 extern int arch_remove_memory(u64 start
, u64 size
);
108 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
109 unsigned long nr_pages
);
110 #endif /* CONFIG_MEMORY_HOTREMOVE */
112 /* reasonably generic interface to expand the physical pages in a zone */
113 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
114 unsigned long nr_pages
);
117 extern int memory_add_physaddr_to_nid(u64 start
);
119 static inline int memory_add_physaddr_to_nid(u64 start
)
125 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
127 * For supporting node-hotadd, we have to allocate a new pgdat.
129 * If an arch has generic style NODE_DATA(),
130 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
132 * In general, generic_alloc_nodedata() is used.
133 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
136 extern pg_data_t
*arch_alloc_nodedata(int nid
);
137 extern void arch_free_nodedata(pg_data_t
*pgdat
);
138 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
140 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
142 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
143 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
147 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
148 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
149 * Because, pgdat for the new node is not allocated/initialized yet itself.
150 * To use new node's memory, more consideration will be necessary.
152 #define generic_alloc_nodedata(nid) \
154 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
157 * This definition is just for error path in node hotadd.
158 * For node hotremove, we have to replace this.
160 #define generic_free_nodedata(pgdat) kfree(pgdat)
162 extern pg_data_t
*node_data
[];
163 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
165 node_data
[nid
] = pgdat
;
168 #else /* !CONFIG_NUMA */
171 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
176 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
179 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
182 #endif /* CONFIG_NUMA */
183 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
185 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
186 extern void __init
register_page_bootmem_info_node(struct pglist_data
*pgdat
);
188 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
192 extern void put_page_bootmem(struct page
*page
);
193 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
196 void get_online_mems(void);
197 void put_online_mems(void);
199 void mem_hotplug_begin(void);
200 void mem_hotplug_done(void);
202 extern void set_zone_contiguous(struct zone
*zone
);
203 extern void clear_zone_contiguous(struct zone
*zone
);
205 #else /* ! CONFIG_MEMORY_HOTPLUG */
207 * Stub functions for when hotplug is off
209 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
210 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
211 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
213 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
217 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
221 static inline void zone_span_writelock(struct zone
*zone
) {}
222 static inline void zone_span_writeunlock(struct zone
*zone
) {}
223 static inline void zone_seqlock_init(struct zone
*zone
) {}
225 static inline int mhp_notimplemented(const char *func
)
227 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
232 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
236 static inline int try_online_node(int nid
)
241 static inline void get_online_mems(void) {}
242 static inline void put_online_mems(void) {}
244 static inline void mem_hotplug_begin(void) {}
245 static inline void mem_hotplug_done(void) {}
247 #endif /* ! CONFIG_MEMORY_HOTPLUG */
249 #ifdef CONFIG_MEMORY_HOTREMOVE
251 extern bool is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
252 extern void try_offline_node(int nid
);
253 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
254 extern void remove_memory(int nid
, u64 start
, u64 size
);
257 static inline bool is_mem_section_removable(unsigned long pfn
,
258 unsigned long nr_pages
)
263 static inline void try_offline_node(int nid
) {}
265 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
270 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
271 #endif /* CONFIG_MEMORY_HOTREMOVE */
273 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
274 void *arg
, int (*func
)(struct memory_block
*, void *));
275 extern int add_memory(int nid
, u64 start
, u64 size
);
276 extern int add_memory_resource(int nid
, struct resource
*resource
, bool online
);
277 extern int zone_for_memory(int nid
, u64 start
, u64 size
, int zone_default
,
279 extern int arch_add_memory(int nid
, u64 start
, u64 size
, bool for_device
);
280 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
281 extern bool is_memblock_offlined(struct memory_block
*mem
);
282 extern void remove_memory(int nid
, u64 start
, u64 size
);
283 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
);
284 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
285 unsigned long map_offset
);
286 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
288 extern bool zone_can_shift(unsigned long pfn
, unsigned long nr_pages
,
289 enum zone_type target
, int *zone_shift
);
291 #endif /* __LINUX_MEMORY_HOTPLUG_H */